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driver/ddr/fsl: Add workaround for erratum A-009801

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The initial training for the DDRC may provide results that are not
optimized. The workaround provides better read timing margins.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
Shengzhou Liu 2016-03-16 13:50:23 +08:00 • committed by York Sun
parent 4a68489e12
commit 5fc62fe570
3 changed files with 12 additions and 0 deletions
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7
drivers/ddr/fsl/fsl_ddr_gen4.c
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@ -251,6 +251,13 @@ void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
}
#endif
#ifdef CONFIG_SYS_FSL_ERRATUM_A009801
temp32 = ddr_in32(&ddr->debug[25]);
temp32 &= ~DDR_CAS_TO_PRE_SUB_MASK;
temp32 |= 9 << DDR_CAS_TO_PRE_SUB_SHIFT;
ddr_out32(&ddr->debug[25], temp32);
#endif
#ifdef CONFIG_SYS_FSL_ERRATUM_A009942
ddr_freq = get_ddr_freq(ctrl_num) / 1000000;
tmp = ddr_in32(&ddr->debug[28]);